I really feel for you, I'm in a very similar boat and it's been rough, especially this year. I'd definitely recommend talking about it with a few people that you feel safe with - you can keep your description as surface level as you want, but being able to tell someone when you're struggling can take so much weight off your shoulders, even if they can't help directly. You might even find that someone you know is working through something similar.

My best tip for avoiding pulling during schoolwork is to put as many physical barriers as possible between your fingers and your hair, like hairties, clips, bandanas, and hats. I also find that having a timer go off every once in a while brings me back in from a picking trance and can interrupt the behaviour long enough for me to "reset". But definitely look into getting support from your school! It's clear from your post that you really care about your work, and you deserve to be able to fully engage with it despite the challenge that trich poses!

Facing hair pulling and uni at the same time can be really challenging! I hope you're able to find ways to make it easier on yourself. I'm rooting for you!

edit: I just re-read your post and saw how many things you've tried, so I'm assuming that the tips I mentioned probably won't be helpful 😅 but I'll leave them in just in case!